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Proceedings Paper

A general ocean color atmospheric correction scheme based on principal components analysis: Part II. Level 4 merging capabilities
Author(s): Lydwine Gross-Colzy; Stéphane Colzy; Robert Frouin; Patrice Henry
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Paper Abstract

The Ocean Color Estimation by principal component ANalysis (OCEAN) algorithm performs atmospheric correction of satellite ocean-color imagery in the presence of various aerosol contents and types, including absorbing mixtures, and for the full range of water properties (Case 1 and Case 2 waters), retrieving diffuse water reflectance with good theoretical accuracy. It is easy to implement and has several advantages for operational processing lines: (1) It has de-noising abilities, for it is based on principal component analysis and neural networks, (2) it is able to perform atmospheric correction through cirrus and thin clouds, (3) it is able to retrieve water reflectance in the presence of Sun glint until a glint reflectance of 0.2, and more importantly, (4) it is less sensitive to absolute radiometric calibration and directionality than classical ocean-color algorithms. This allows multi-sensor merging (denoted hereafter Level 4 synthesis). These abilities may improve dramatically the daily spatial coverage of ocean color products. In the companion paper (Part I), the theoretical performance of OCEAN in situations of both Case 1 and Case 2 waters is presented for various multispectral radiometers (i.e., POLDER, SeaWiFS, MODIS, MERIS). In this paper (Part II), the focus is made on OCEAN de-noising and merging properties. The ability of the algorithm to work in situations of Sun glint and cirrus/thin clouds is illustrated using MERIS imagery. Multi-directional merging is demonstrated using POLDER imagery (daily and temporal merging), and multi-sensor merging using SeaWiFS and MODIS imagery (daily merging). The resulting products do not show directional artifacts.

Paper Details

Date Published: 5 October 2007
PDF: 12 pages
Proc. SPIE 6680, Coastal Ocean Remote Sensing, 668003 (5 October 2007); doi: 10.1117/12.738514
Show Author Affiliations
Lydwine Gross-Colzy, Capgemini Space Unit (France)
Stéphane Colzy, Magellium (France)
Robert Frouin, Scripps Institution of Oceanography (United States)
Patrice Henry, Ctr. National d'Études Spatiales (France)

Published in SPIE Proceedings Vol. 6680:
Coastal Ocean Remote Sensing
Robert J. Frouin; ZhongPing Lee, Editor(s)

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